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US$299.00 · In stock
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JJG 488-2018: Instantaneous Daily Clock Time Difference Testers
Status: Valid JJG 488: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 488-2018 | English | 299 |
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3 days [Need to translate]
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Instantaneous Daily Clock Time Difference Testers
| Valid |
JJG 488-2018
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| JJG 488-2008 | English | 519 |
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3 days [Need to translate]
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Verification Regulation of Watch Tester
| Obsolete |
JJG 488-2008
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| JJG 488-1998 | English | 239 |
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2 days [Need to translate]
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Verification Regulation of Watch Tester
| Obsolete |
JJG 488-1998
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| JJG 488-1987 | English | RFQ |
ASK
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3 days [Need to translate]
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Printing Rate Recorder (On Trail)
| Obsolete |
JJG 488-1987
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PDF similar to JJG 488-2018
Basic data | Standard ID | JJG 488-2018 (JJG488-2018) | | Description (Translated English) | Instantaneous Daily Clock Time Difference Testers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A57 | | Word Count Estimation | 13,119 | | Date of Issue | 2018-02-27 | | Date of Implementation | 2018-08-27 | | Older Standard (superseded by this standard) | JJG 488-2008 | | Quoted Standard | JJG 180 | | Regulation (derived from) | AQSIQ Announcement No. 26 of 2018 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | JJG 488-2018: Instantaneous Daily Clock Time Difference Testers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Instantaneous differential measuring instrument verification procedure)
National Metrology Verification Regulations of the People's Republic
Instantaneous daytime measuring instrument
Published on.2018-02-27
2018-08-27 implementation
The General Administration of Quality Supervision, Inspection and Quarantine issued
Instantaneous daytime measuring instrument
Verification procedure
Replace JJG 488-2008
Focal Point. National Time Frequency Measurement Technical Committee
Drafting unit. Shanghai Institute of Metrology and Testing Technology
Guangdong Institute of Metrology
This procedure entrusts the National Time Frequency Measurement Technical Committee to explain
The main drafters of this procedure.
Dong Lian (Shanghai Institute of Metrology and Testing Technology)
Chen Yisheng (Guangdong Institute of Metrology)
Participate in the drafters.
胥婕 (Shanghai Institute of Metrology and Testing Technology)
Xu Liang (Shanghai Institute of Metrology and Testing Technology)
table of Contents
Introduction (II)
1 Scope (1)
2 References (1)
3 Overview (1)
4 Metrology performance requirements (1)
4.1 Instantaneous daily difference (1)
4.2 Instantaneous monthly difference (1)
4.3 Built-in crystal oscillator frequency deviation (2)
5 General technical requirements (2)
6 measuring instrument control (2)
6.1 Verification conditions (2)
6.2 Verification items and verification methods (2)
6.3 Processing of verification results (4)
6.4 Verification cycle (4)
Appendix A Instantaneous Day Difference Measuring Instrument Verification Certificate/Verification Result Notice Page Format (5)
Appendix B Instantaneous Day Difference Measuring Instrument Verification Certificate Verification Result Page Format (6)
Appendix C Instantaneous Day Difference Measuring Instrument Verification Result Notice Result Page Format (7)
Appendix D Instantaneous Day Difference Measuring Instrument Original Record Data Page Format (8)
Introduction
This procedure is based on JJF1001-2011 "General Terms and Definitions" and JJG 180 "Electrical Measuring Instruments"
The British Crystal Oscillator and so on revised the JJG 488-2008 "School Meter", the original name "school meter" was changed to "instantaneous
The daily difference measuring instrument" expands the scope of application of the procedure.
Compared with JJG 488-2008, in addition to editorial changes, the main technical changes are as follows.
--- Increase the introduction;
--- Increasing the daily difference and increasing the monthly measurement performance requirements;
---Extended daily difference, monthly difference center frequency;
--- Increase the equipment for verification and expand the scope to clarify the technical requirements;
---Uniform electronic and mechanical measuring instruments for different built-in sensors;
--- Increase the format of the verification record format and the page within the verification result notice.
The previous versions of this procedure are released as follows.
---JJG 488-2008;
---JJG 488-1998.
Instantaneous day difference measuring instrument verification procedure
1 Scope
This procedure is applicable to the first verification, subsequent verification and in-use inspection of various instantaneous day difference measuring instruments.
2 reference files
This procedure refers to the following documents.
JJG 180 electronic measuring instrument quartz crystal oscillator
Note. For dated references, only the dated version applies to this procedure; for undated references, the most
The new version (including all amendments) applies to this procedure.
3 Overview
The daily difference is the travel time error of the timer. The daily difference that is quickly measured in a short time is called the instantaneous day.
difference. Instantaneous day-to-day measuring instruments are generally composed of sensors, electronic controls and display circuits (see Figure 1).
Various sensors, such as electric and magnetic, receive various types of oscillation/beat signals from the timer, and are amplified.
Obtain the travel time second signal, and control the counter to count it, and obtain the count of the standard time pulse in one signal period.
The value is collected and calculated by the microprocessor to quickly measure and display the instantaneous time difference.
Figure 1 Block diagram of instantaneous day difference measuring instrument
Instantaneous daily difference measuring instrument is widely used in watch production enterprises, power industry, product quality inspection institutions and measurement
Verification department.
4 Metrological performance requirements
4.1 Instantaneous daily difference
4.1.1 Measurement range. (-9.999~9.999)s, (-99.99~99.99)s;
4.1.2 Maximum allowable error. ±0.001s, ±0.01s.
4.2 Instantaneous monthly difference
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